c# - The property " MandatID " is part of the key information of the object and can not be changed -

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i'm working on asp.net mvc 4 project , i'm using entityframework connect database. have 4 table :

  • mandat: primarykey mandatid
  • commande: composite primarykey commandeid, mandatid , foriengkey mandatid references mandat
  • article: composite primarykey articleid, mandatid , foriengkey mandatid references mandat
  • lignecommande (association table) : composite primarykey commandeid, articleid, mandatid , foriengkey commandeid, mandatid --> commande articleid, mandatid --> article mandatid --> mandat

when try add or modify lignecommande had folowing exception:

the property " mandatid " part of key information of object , can not changed.


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